Joe Jonas Turns Away 'Aggressive' Girls During Guys Night Out

Joe Jonas was ready to party on Thursday night – but only with his boys.

The musician came through Beacher's Madhouse at the Hollywood Roosevelt Hotel with a large entourage at around 11:45 p.m. Once inside, the group was escorted to a table and helped by a cocktail waitress, who poured Jonas several vodka drinks throughout the night.

"He was very friendly with the staff at the club who came to say hello," an onlooker tells PEOPLE. "Throughout the night, he was approached by different women. Sometimes he was polite and other times he seemed more annoyed."

Why? The onlooker explains: "The girls were fairly aggressive with him. It was clear Joe wasn't interested in any of them."